/* 页面整体 */
body {
    margin: auto;
    max-width: 580px;
    font-size: 14px;
    font-family: Helvetica, Arial, sans-serif;
    }
    /* 页脚 */
footer {
    color: #888;
    margin-top: 15px;
    text-align: center;
     padding: 10px;
    }
    /* 头像 */
.avatar {
    width: 30px;
    }
    /* 电影列表 */
.book-list {
    list-style-type: none;
    padding: 0;
    margin-bottom: 10px;
    box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.16), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
    }
.book-list li {
    padding: 12px 24px;
    border-bottom: 1px solid #ddd;
    }
.book-list li:last-child {
    border-bottom:none;
    }
.book-list li:hover {
    background-color: #f8f9fa;
    }
nav ul {
        list-style-type: none;
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #333;
    }
nav li {
    float: left;
    }
nav li a {
    display: block;
    color: white;
    text-align: center;
    padding: 8px 12px;
    text-decoration: none;
    }
nav li a:hover {
    background-color: #111;
    }

.inline-form {
        display: inline;
    }
.float-right{
    float:right;
    }

.douban {
    font-size: 12px;
    font-weight: bold;
    color: black;
    text-decoration: none;
    background: rgb(66,189,86);
    border-radius: 5px;
    padding: 3px 5px;
    }

input[type=submit] {
    font-family: inherit;
    }
input[type=text] {
    border: 1px solid #ddd;
    }
input[name=ISBN] {
    width: 200px;
    }
.btn,.del-btn{
    font-size: 12px;
    padding: 1.5px 4px;
    text-decoration: none;
    cursor: pointer;
    background-color: white;
    color: black;
    border: 1px solid #555555;
    border-radius: 5px;
    }
.btn:hover {
    text-decoration: none;
    background-color: black;
    color: white;
    border: 1px solid black;
    }
.del-btn:hover {
    text-decoration: none;
    background-color: rgb(200,0,0);
    color: white;
    border: 1px solid rgb(200,0,0);
    }
.alert {
    position: relative;
    padding: 7px;
    margin: 7px 0;
    border: 1px solid transparent;
    color: #004085;
    background-color: #cce5ff;
    border-color: #b8daff;
    border-radius: 5px;
    }